JP2011179446A - Engine start control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To start an engine by continuing a driving condition of a starter by a relatively easy control processing even when a CPU is reset during the drive of the starter. <P>SOLUTION: The CPU 12 is configured to ignore the establishment of a starter stop condition until a prescribed starter stop condition ignoring time elapses from a reset return when the CPU 12 is reset during the drive of the starter 17 due to a source voltage drop. This configuration can prevent the starter 17 from being stopped by the establishment of the starter stop condition at the reset return of the CPU 12, and enable the engine to start by continuing the cranking of the engine. Herein, the starter stop condition ignoring period can be set based on at least any one of a power supply voltage (a battery voltage), air temperature, oil temperature, cooling water temperature, the number of reset times during one cranking, engine rotating speed, and communication establishment time of an on-vehicle network. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an engine start control device configured to control the start / stop of a starter for starting an engine with a CPU.

  In vehicles that have recently become electronically controlled, as described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-291863), a push operation type start switch is used instead of a rotation operation type ignition key switch. There is also a type in which a starter driving command is output from the CPU by driving the start switch push operation signal to the CPU, and the starter is driven to crank the engine and start the engine.

  In this case, the starter is stopped when the starter stop condition is satisfied while the starter is driven, and the starter is prohibited from being driven when the starter stop condition is satisfied while the starter is stopped. Here, as the starter stop condition, for example, engine start completion determination (engine rotation speed exceeds start completion determination rotation speed), long-time cranking determination (cranking time is set from the viewpoint of battery protection, the allowable maximum Cranking time exceeded), vehicle speed judgment (vehicle speed exceeds predetermined vehicle speed), shift range judgment (shift range is not P or N range), fuel leak judgment (fuel leak detected), immobilizer judgment (The ID code verification is not completed between the driver's key and the vehicle ECU), fuel pressure determination (the fuel pressure necessary for starting the engine is not secured), and the like.

  Further, since a large current flows from the battery to the starter while the starter is being driven, it is inevitable that the battery voltage temporarily decreases. The CPU that controls start / stop of the starter is also supplied with the power supply voltage from the battery. Therefore, when the charge capacity of the battery is low, the power supply voltage of the CPU falls below the guaranteed operating voltage while the starter is driven. There is a possibility that the CPU is reset.

JP 2008-291863 A

  By the way, if the power supply voltage of the CPU falls below the operation guarantee voltage and the CPU is reset while the starter is being driven, the starter is stopped because the starter stop condition is satisfied or the starter stop condition is unclear. The engine may not start.

  Therefore, in Patent Document 1 described above, a starter control is performed while the starter is being driven by using a CPU (power supply ECU) having a lower operation guaranteed voltage than the starter control CPU in addition to the starter control CPU (engine ECU). When the operation CPU is reset, the CPU (power supply ECU) having the lower guaranteed operation voltage maintains the starter relay for a while to continue energizing the starter and start the engine.

  However, this configuration has a drawback in that the control processing of the two CPUs (ECUs) needs to be linked for engine start control (starter drive / stop control), which complicates the control processing.

  Therefore, the problem to be solved by the present invention is that even if the CPU is reset during driving of the starter, the starter driving state can be continuously started with a relatively simple control process, and starting by resetting the CPU is performed. It is an object to provide an engine start control device that can improve the problem of defects at low cost.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a CPU for controlling start / stop of a starter that cranks the engine when the engine is started, and the CPU satisfies a starter stop condition during driving of the starter. The starter is stopped when the starter is stopped, and when the starter stop condition is satisfied while the starter is stopped, the engine start control device prohibits the starter from being driven. The CPU is configured to ignore establishment of the starter stop condition until a predetermined period elapses from the return. According to this configuration, even if the CPU is reset while the starter is being driven, since the starter stop condition is ignored until a predetermined period has elapsed since the reset return, the starter stop condition is satisfied when the CPU is reset. The starter can be prevented from being stopped, and the engine can be started by continuing the cranking of the engine. As a result, even when the CPU is reset during driving of the starter, the engine can be started with a relatively simple control process, and the problem of starting failure due to the resetting of the CPU can be improved at a low cost.

  In this case, the period during which the starter stop condition is ignored after the reset of the CPU is reset (hereinafter referred to as “starter stop condition ignoring period”) may be a predetermined period. The condition ignoring period is set based on at least one of power supply voltage (battery voltage), outside air temperature, oil temperature, cooling water temperature, number of resets during one cranking, engine speed, and communication establishment time of the in-vehicle network. You may do it.

  For example, the lower the power supply voltage (battery voltage), the easier the CPU resets. Therefore, the lower the power supply voltage, the longer the starter stop condition ignoring period. Since the cranking time tends to be longer as the outside air temperature and the engine temperature (oil temperature, cooling water temperature) are lower, the starter stop condition ignoring period is preferably lengthened as the outside air temperature and the engine temperature are lower. If the CPU resets repeatedly during one cranking, the cranking time becomes long and the battery load becomes too large. Therefore, the starter stop condition ignore period is limited according to the number of resets during one cranking. Good. As the engine speed increases, the time until the engine start completion time (starter stop timing) tends to be shortened. Therefore, the starter stop condition ignoring period may be shortened as the engine speed increases. The longer the communication establishment time of the in-vehicle network that transmits information on the establishment / non-establishment of the starter stop condition, the longer the time until the information on establishment / non-establishment of the starter stop condition is transmitted from another CPU (ECU). The longer the communication establishment time of the in-vehicle network is, the longer the starter stop condition ignoring period should be.

  In this case, the starter stop condition is at least one of long-time cranking determination, vehicle speed determination, engine start completion determination, shift range determination, fuel leak determination, immobilizer determination, fuel pressure determination, and starter abnormality determination. One should be included. Here, in the long-time cranking determination, the starter stop condition is satisfied when the cranking time exceeds the allowable maximum cranking time set from the viewpoint of battery protection. In the vehicle speed determination, the starter stop condition is satisfied when the vehicle speed exceeds a predetermined vehicle speed. In the engine start completion determination, the starter stop condition is satisfied when the engine rotation speed exceeds the start completion determination rotation speed. In the shift range determination, the starter stop condition is satisfied when the shift range is not the P or N range. In the fuel leak determination, the starter stop condition is satisfied when the fuel leak is detected. In the immobilizer determination, the starter stop condition is satisfied when the ID code verification is not completed between the driver's key and the immobilizer ECU. In the fuel pressure determination, the starter stop condition is satisfied when the fuel pressure necessary for starting the engine is not secured. In the starter abnormality determination, a starter stop condition is established when a starter abnormality is detected by a starter abnormality diagnosis function mounted on the vehicle.

  Further, as in claim 4, when the CPU is reset during driving of the starter, the CPU may be initialized to the side where the starter stop condition is not satisfied when returning from the reset. Even in this case, it is possible to prevent the starter from being stopped due to the starter stop condition being satisfied when the CPU is reset. Therefore, even when the CPU is reset while the starter is being driven, the cranking is continued with a relatively simple control process. Thus, the engine can be started, and the problem of starting failure due to CPU reset can be improved at low cost.

FIG. 1 is a block diagram schematically showing the configuration of an engine start control device in Embodiment 1 of the present invention. FIG. 2 is a time chart for explaining processing contents when a CPU reset occurs during starter driving of the first embodiment. FIG. 3 is a flowchart showing the flow of processing of the CPU reset return processing routine of the first embodiment. FIG. 4 is a time chart for explaining processing contents when a CPU reset occurs during starter driving of the second embodiment. FIG. 5 is a flowchart showing the flow of processing of the CPU reset return processing routine of the second embodiment.

  Hereinafter, two Examples 1 and 2 which embody the form for implementing this invention are demonstrated.

A first embodiment of the present invention will be described with reference to FIGS.
First, the configuration of the engine start control device will be schematically described with reference to FIG.
The engine start control device is configured using an ECU 11 to which a power supply voltage is supplied from a battery 10 mounted on a vehicle. The ECU 11 includes a CPU 12, a ROM (not shown), a RAM (not shown), and a hardware latch. Circuits 13A and 13B (holding circuit), drivers 14A and 14B for driving the starter relay 15, and the like are mounted. When the starter relay 15 is turned on, the starter 17 is energized (starter is turned on), the engine is cranked and started, and when the starter relay 15 is turned off, the starter 17 is energized. Stopped (starter OFF). A start signal (start request) is input to the CPU 12 by a push operation of a push operation type start switch 16. In this embodiment, two systems of drivers 14A and 14B for driving the starter relay 15 and hardware latch circuits 13A and 13B are provided.

  When the driver pushes the start switch 16 and inputs a start signal to the CPU 12, a starter ON command is output from the CPU 12 to the hardware latch circuits 13A and 13B, and an ON signal (high level signal) is output from the hardware latch circuits 13A and 13B. Is output to the drivers 14A and 14B. As a result, the starter relay 15 is turned on, the starter 17 is turned on, and the engine is cranked.

  In a state where the starter 17 is turned on by outputting an ON signal (high level signal) from the hardware latch circuits 13A and 13B (during engine cranking), the CPU 12 is reset due to the voltage drop of the battery 10, and the starter ON command is issued. Even if the output is stopped, the outputs of the hardware latch circuits 13A and 13B are not immediately turned OFF (low level), and the outputs of the hardware latch circuits 13A and 13B are turned ON until a predetermined time (for example, 400 ms) has elapsed since the reset. The starter 17 is kept in the ON state for a predetermined time (for example, 400 ms).

  The CPU 12 sets the start time of the starter 17 from the viewpoint of protection of the battery 10 when the start speed of the starter 17 exceeds the start completion determination and the start speed of the starter 17 is determined to be complete. When the allowable maximum cranking time is reached, the starter stop condition is satisfied and a starter OFF command (starter stop command) is output to the hardware latch circuits 13A and 13B. When a starter OFF command is input, the hardware latch circuits 13A and 13B immediately reverse the output to OFF (low level), turn off the starter relay 15, and turn off the starter 17.

  In the first embodiment, the starter stop condition (driving prohibition condition) includes, for example, vehicle speed determination, shift range determination, fuel leak determination, immobilizer determination, fuel pressure, in addition to the above-described engine start completion determination and long-time cranking determination. It includes at least one of determination, starter abnormality determination, and service factory check determination. However, the present invention is not limited to a system having all of these starter stop conditions, and it goes without saying that some starter stop conditions may be omitted or other starter stop conditions may be added.

Here, in the vehicle speed determination, the starter stop condition is satisfied when the vehicle speed exceeds a predetermined vehicle speed. In the shift range determination, the starter stop condition is satisfied when the shift range is not the P or N range.
In the fuel leak determination, the starter stop condition is satisfied when the fuel leak is detected.

In the immobilizer determination, the starter stop condition is satisfied when the ID code verification is not completed between the driver's key and the immobilizer ECU.
In the fuel pressure determination, the starter stop condition is satisfied when the fuel pressure necessary for starting the engine is not secured.

In the starter abnormality determination, the starter stop condition is satisfied when an abnormality of the starter 17 is detected by the starter abnormality diagnosis function mounted on the vehicle.
In the determination for service factory check, the starter stop condition is satisfied when the service mode is set to prohibit the starter 17 from being driven at the time of inspection and repair at the service factory.

  Therefore, when the starter stop condition is determined by the CPU 12 for starter control and when the starter stop condition is determined by another CPU (ECU), a signal indicating whether the starter stop condition is satisfied or not is transmitted from the other CPU (ECU). , May be transmitted to the starter control CPU 12 via an in-vehicle network such as LIN.

  By the way, if the power supply voltage of the CPU 12 falls below the operation guarantee voltage while the starter 17 is ON and the CPU 12 is reset, then the CPU 12 executes a predetermined initial process when returning from the reset, and then shifts to a normal process. To do. At this time, as shown in FIG. 2, the outputs of the hardware latch circuits 13A and 13B are held ON (high level) until a predetermined time (for example, 400 ms) elapses from the reset of the CPU 12, and the ON state of the starter 17 is maintained for a predetermined time. (For example, 400 ms) is held.

  In the conventional system, the starter ON / OFF command output from the CPU 12 is initialized to the “OFF command” in the initial process at the time of reset recovery as well as the initial process executed when the normal CPU power is turned on. If the CPU 12 is reset while the power is on, the starter 17 is turned off by the initial process at the time of resetting, and the engine cannot be started.

  Therefore, in the first embodiment, when the reset occurs, the CPU 12 confirms the ON / OFF state of the starter 17 when returning from the reset, and the starter 17 is turned on by the hardware latch circuits 13A and 13B. When it is determined that the initial state is maintained, the initial processing of the CPU 12 is changed to “initial processing during start” in which the starter 17 is kept on and executed.

  Here, the initial process during start-up includes a process for initializing the starter ON / OFF command output to the hardware latch circuits 13A and 13B to an ON command, and a software latch flag for determining the ON / OFF state of the starter 17 before resetting. Includes a process of setting to ON (a process of setting a flag indicating that the starter 17 has been in an ON state from before the reset). In this way, it is possible to prevent the starter 17 from being turned off by initializing the starter ON / OFF command output from the CPU 12 to the “OFF command” by the initial process when the CPU 12 is reset.

  Next, a method for confirming the ON / OFF state of the starter 17 when the CPU 12 is reset will be described. The ON / OFF state of the starter 17 can be confirmed by detecting the current flowing through the starter 17 and the starter relay 15, but in the first embodiment, the state of the output side of the hardware latch circuits 13A and 13B is confirmed. 17 is judged ON / OFF. The state of the output side of the hardware latch circuits 13A and 13B may be confirmed by detecting the voltage at the output terminal of the hardware latch circuits 13A and 13B, or the voltage at the starter drive port of the ECU 11 (output terminals of the drivers 14A and 14B). May be detected.

  As another confirmation method, the data of the ON / OFF state of the starter 17 before the reset of the CPU 12 is written in a rewritable nonvolatile storage means (for example, a backup RAM), and when the CPU 12 is reset to the reset state, Although it is conceivable to check the ON / OFF state of the starter 17 by reading the storage data of the storage means, in this method, there is a possibility that the past start data is stored in the nonvolatile storage means. There is a possibility that the ON / OFF state of the starter 17 is erroneously determined when resetting.

  In this regard, as in the first embodiment, when the state of the output side of the hardware latch circuits 13A and 13B is confirmed at the time of reset recovery and the starter 17 is turned on / off, the actual starter at the time of reset recovery is determined. It is possible to accurately determine the 17 ON / OFF state.

  On the other hand, as described above, the starter stop condition determination method includes the case where the starter control CPU 12 determines the starter stop condition, and the other CPU (ECU) determines the starter stop condition, and the other CPU (ECU ) May be transmitted to the starter control CPU 12 via a vehicle-mounted network such as CAN or LIN. The starter control CPU 12 outputs a starter OFF command to stop the starter 17 when the starter stop condition is satisfied while the starter 17 is being driven, and stops the starter 17 while the starter 17 is stopped. 17 is prohibited.

  If the power supply voltage of the CPU 12 falls below the operation guarantee voltage and the starter control CPU 12 is reset while the starter 17 is being driven, other CPUs (ECUs) may be reset at the same time. In other CPUs (ECUs), the starter 17 is initialized to the side where the starter stop condition is satisfied at the time of reset, and the information is transmitted to the CPU 12 for starter control. Thereafter, when the system check is completed, the starter 17 In some cases, a signal for permitting driving of the motor is transmitted to the CPU 12 for starter control. For this reason, in the conventional system, when the starter control CPU 12 is reset and returned, the starter 12 is stopped by the starter stop condition satisfaction signal transmitted from the other CPU (ECU) to the starter control CPU 12, and the engine is started. It may not be possible.

  Therefore, in the first embodiment, when the CPU 12 is reset while the starter 17 is being driven, the CPU 12 ignores the establishment of the starter stop condition until a predetermined starter stop condition ignoring period elapses from the reset return. is doing. By doing so, it is possible to prevent the starter 17 from being stopped due to establishment of the starter stop condition when the CPU 12 is reset, and the engine can be started by continuing the cranking of the engine.

  In this case, the period during which the starter stop condition is ignored after the reset of the CPU 12 (hereinafter referred to as “starter stop condition neglect period”) may be a predetermined period. In the first embodiment, the starter stop condition The ignore period is set based on at least one of the power supply voltage (battery voltage), the outside air temperature, the oil temperature, the coolant temperature, the number of resets during one cranking, the engine speed, and the communication establishment time of the in-vehicle network. I have to.

  For example, the lower the power supply voltage (battery voltage), the easier the reset of the CPU 12 occurs. Therefore, the lower the power supply voltage, the longer the starter stop condition ignoring period. Since the cranking time tends to be longer as the outside air temperature and the engine temperature (oil temperature, cooling water temperature) are lower, the starter stop condition ignoring period is preferably lengthened as the outside air temperature and the engine temperature are lower. If the reset of the CPU 12 repeatedly occurs during one cranking, the cranking time becomes long and the burden on the battery 10 becomes too large. Therefore, the starter stop condition ignoring period is set according to the number of resets during one cranking. Limit it. As the engine speed increases, the time until the engine start completion time (stop timing of the starter 17) tends to be shortened. Therefore, the starter stop condition ignoring period may be shortened as the engine speed increases. The longer the communication establishment time of the in-vehicle network becomes, the longer the time until the engine start permission signal is transmitted from another CPU (ECU). Therefore, the longer the communication establishment time of the in-vehicle network becomes, the longer the starter stop condition ignoring period becomes. Longer is better.

  The CPU reset return process of the first embodiment described above is executed by the CPU 12 according to the CPU reset return process routine of FIG. The CPU reset recovery processing routine of FIG. 3 is repeatedly executed at a predetermined cycle. When this routine is started, it is first determined in step 101 whether or not the CPU 12 has been reset. If no reset has occurred, it is not necessary to perform reset recovery processing, so the subsequent processing is performed. This routine is terminated.

  On the other hand, if it is determined in step 101 that the CPU 12 has been reset, the process proceeds to step 102 and waits until the reset is restored. Thereafter, when the reset is restored, the process proceeds to step 103 where the state of the starter drive port of ECU 11 (the output terminals of drivers 14A and 14B) is confirmed, and in the next step 104, the state of the starter drive port of ECU 11 is determined. It is determined whether the starter 17 is ON / OFF. If it is determined in this step 104 that the starter 17 is in the OFF state, the process proceeds to step 106 where normal initial processing is executed and the starter ON / OFF command output from the CPU 12 to the hardware latch circuits 13A and 13B is changed to the OFF command. At the same time, the software latch flag for determining the ON / OFF state of the starter 17 before reset is initialized to OFF, and this routine is terminated. As a result, even after resetting, the starter 17 is maintained in the same OFF state as before resetting.

  On the other hand, if it is determined in the above step 104 that the starter 17 is in the ON state, the process proceeds to step 105 to execute the initial process during start and turn on the starter ON / OFF command output from the CPU 12 to the hardware latch circuits 13A and 13B. The software latch flag for determining the ON / OFF state of the starter 17 before resetting is initialized to ON while being initialized to the command. Thereby, even after resetting, the starter 17 is maintained in the same ON state as before resetting.

  Thereafter, the routine proceeds to step 107, where the starter stop condition ignoring time for ignoring the establishment of the starter stop condition after the initial processing during start is calculated. At this time, a starter such as a map based on at least one of a power supply voltage (battery voltage), an outside air temperature, an oil temperature, a cooling water temperature, a reset count during one cranking, an engine rotation speed, and a communication establishment time of an in-vehicle network. Calculate stop condition ignore time.

  Thereafter, the process proceeds to step 108, and the elapsed time after the initial process during start is compared with the starter stop condition ignoring time. If the elapsed time after the initial process during start is determined to be within the starter stop condition ignoring time, step 109 is performed. Even if a starter stop condition satisfaction signal is input to the CPU 12 from another CPU (ECU) or the starter stop condition is satisfied in other processing executed by the CPU 12, the starter stop condition is ignored. The starter 17 is kept on. The ON state of the starter 17 is continued until the elapsed time after the initial processing during startup reaches the starter stop condition ignoring time.

  Thereafter, when the elapsed time after the initial processing during startup reaches the starter stop condition ignoring time, the routine proceeds to step 110, where it is determined whether the starter stop condition is satisfied, and it is determined that the starter stop condition is not satisfied. Then, the process proceeds to step 111, and the starter 17 is kept in the ON state. Thereafter, when the starter stop condition is satisfied, the routine proceeds to step 112, where a starter OFF command is output from the CPU 12 to turn off the starter 17, and the software latch flag is turned off, and this routine is terminated.

  According to the first embodiment described above, even if the CPU 12 is reset due to a decrease in the power supply voltage (battery voltage) while the starter 17 is being driven, the starter is not restarted until a predetermined starter stop condition ignoring time elapses. Since the starter 17 is maintained in a driving state ignoring the establishment of the stop condition, the starter 17 can be prevented from being stopped due to the starter stop condition being satisfied when the CPU 12 is reset, and the engine cranking is continued. Can be started. As a result, even when the CPU 12 is reset while the starter 17 is being driven, the engine can be started with a relatively simple control process, and the problem of starting failure due to the reset of the CPU 12 can be improved at a low cost. .

  In the first embodiment, when the CPU 12 is reset while the starter 17 is being driven, the establishment of the starter stop condition is ignored until a predetermined starter stop condition ignore time elapses from the reset return. 4 and FIG. 5, in the second embodiment of the present invention, when the CPU 12 is reset while the starter 17 is being driven, the starter stop condition is not satisfied when returning from the reset (the starter 17 is permitted to be driven). It is configured to be initialized to the other side. Here, the starter stop condition is the same as in the first embodiment.

  The CPU reset recovery process of the second embodiment is executed by the CPU 12 according to the CPU reset recovery process routine of FIG. The CPU reset recovery processing routine of FIG. 5 is repeatedly executed at a predetermined cycle.

  The processing in steps 201 to 204 of the CPU reset return processing routine in FIG. 5 is the same as the processing in steps 101 to 104 in the CPU reset return processing routine in FIG. 3 described in the first embodiment. That is, when the reset of the CPU 12 occurs in steps 201 to 203, the state of the starter drive port of the ECU 11 is confirmed at the time of reset return, and in the next step 204, the starter 17 is changed from the state of the starter drive port of the ECU 11. Determine ON / OFF. If it is determined in step 204 that the starter 17 is in the OFF state, the process proceeds to step 206, where the normal initial processing is executed, and the starter ON / OFF command output from the CPU 12 to the hardware latch circuits 13A and 13B is changed to the OFF command. At the same time, the software latch flag for determining the ON / OFF state of the starter 17 before reset is initialized to OFF, and this routine is terminated. As a result, even after resetting, the starter 17 is maintained in the same OFF state as before resetting.

  On the other hand, if it is determined in step 204 that the starter 17 is in the ON state, the process proceeds to step 205 where the initial process during start is executed and the starter stop condition is not satisfied (the starter 17 is permitted to be driven). The starter ON / OFF command output from the CPU 12 to the hardware latch circuits 13A and 13B is initialized to the ON command, and the software latch flag for determining the ON / OFF state of the starter 17 before the reset is initialized to ON. Turn into. As a result, the drive of the starter 17 is permitted even after resetting, and the starter 17 is maintained in the same ON state as before the reset.

  Thereafter, the process proceeds to step 207 to determine whether or not the starter stop condition is satisfied. If it is determined that the starter stop condition is not satisfied, the process proceeds to step 208 and the starter 17 is kept in the ON state. Thereafter, when the starter stop condition is satisfied, the routine proceeds to step 209, where the starter OFF command is output from the CPU 12 to turn off the starter 17, and the software latch flag is turned off, and this routine is terminated.

  In the second embodiment described above, when the CPU 12 is reset while the starter 17 is being driven, the CPU 12 is initialized to the side where the starter stop condition is not satisfied when returning from the reset. The starter 17 can be prevented from stopping due to the establishment of the stop condition. Even when the CPU 17 is reset while the starter 17 is being driven, it is possible to continue the cranking with a relatively simple control process and start the engine. It is possible to improve the problem of starting failure due to resetting at low cost.

  In the configuration example of FIG. 1, two systems of drivers 14A and 14B and hardware latch circuits 13A and 13B for driving the starter relay 15 are provided, but only one system or three or more systems may be provided.

Further, the present invention is not limited to a manual start system, but can be applied to an engine automatic stop / restart system (idle stop system).
In addition, the present invention can be implemented with various modifications within a range not departing from the gist, such as appropriately changing the configuration of the ECU 11.

  DESCRIPTION OF SYMBOLS 10 ... Battery, 11 ... ECU, 12 ... CPU, 13A, 13B ... Hardware latch circuit (holding circuit), 14A, 14B ... Driver, 15 ... Starter relay, 16 ... Push operation type start switch, 17 ... Starter

Claims (4)

A CPU for controlling start / stop of a starter that cranks the engine at the time of starting the engine, and the CPU stops the starter when a starter stop condition is satisfied while the starter is being driven; In the engine start control device that prohibits driving of the starter when the starter stop condition is satisfied,
When the CPU is reset during driving of the starter, the engine start control device ignores the establishment of the starter stop condition until a predetermined period has elapsed from the reset return.   The CPU ignores the establishment of the starter stop condition after resetting, the power supply voltage, the outside air temperature, the oil temperature, the cooling water temperature, the number of resets during one cranking, the engine speed, and the establishment of communication in the in-vehicle network. The engine start control device according to claim 1, wherein the engine start control device is set based on at least one of the times.   The starter stop condition includes at least one of long-time cranking determination, vehicle speed determination, engine start completion determination, shift range determination, fuel leak determination, immobilizer determination, fuel pressure determination, and starter abnormality determination. Item 3. The engine start control device according to Item 1 or 2. A CPU for controlling start / stop of a starter that cranks the engine at the time of starting the engine, and the CPU stops the starter when a starter stop condition is satisfied while the starter is being driven; In the engine start control device that prohibits driving of the starter when the starter stop condition is satisfied,
When the CPU is reset during driving of the starter, the CPU is reset to the side where the starter stop condition is not satisfied when returning from the reset. Engine start control device.

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